[single-trailing-newline] Add type definitions (#47592)

types/single-trailing-newline/index.d.ts

@@ -0,0 +1,11 @@
+// Type definitions for single-trailing-newline 1.0
+// Project: https://github.com/johnotander/single-trailing-newline
+// Definitions by: Peter Juras <https://github.com/peterjuras>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Takes a string and returns it with a single trailing newline
+ */
+declare function singleTrailingNewline(str: string): string;
+
+export = singleTrailingNewline;

types/single-trailing-newline/single-trailing-newline-tests.ts

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+import singleTrailingNewline = require('single-trailing-newline');
+
+singleTrailingNewline(''); // $ExpectType string

types/single-trailing-newline/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "single-trailing-newline-tests.ts"
+    ]
+}

types/single-trailing-newline/tslint.json

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+{ "extends": "dtslint/dt.json" }